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Rifles, Reloading, Optics, Equipment
Reloading
Primer pocket truing
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<blockquote data-quote="Coyote Shadow Tracker" data-source="post: 2630882" data-attributes="member: 116439"><p>They sell different size Prime Flash Hole Uniformers. Lapua Claims that their cases are already debured and don't need deburing. LAPUA also has a different size flash hole then other manufactures - so if you are going to uniform your Flash Holes make sure you use the correct tool.</p><ul> <li data-xf-list-type="ul">.062 for Lapua 1.5mm flash holes</li> <li data-xf-list-type="ul">.080 for "standard" flash holes</li> </ul><p>The brass case is very important and sometimes important details are overlooked–such as the Primer Pocket and Flash Hole inside of the case.</p><p></p><p>In cartridge manufacturing, the flash hole is "punched" into the brass. While this is the least expensive method, it has many shortcomings and inconsistencies. The flash holes, therefore, are of different sizes and shapes. The most detrimental to accuracy are the irregular "breakouts" and "burrs" on the inside. This will cause "shot-to-shot" differences in Primer "Flame Fronts", causing inconsistent pressure/velocity and, thereby, loss of accuracy. Bench Rest Shooters have been uniforming flash holes since 1969.</p><p>The main reason for Flash Hole uniformity, Primer Pocket Uniformity, Primer Seating Depth is to get PROPER & CONSISTANT Flash Burn.</p><p>Naturally you need to use the correct tools when preforming these modifications.</p><p></p><p>With the Precision K & M UNIFORMER tools, you can realize the potential accuracy by simultaneously reaming, de-burring and chamfering the inside of the flash hole. The unique features of the K & M Tools provide uniformity with a pre-set depth stop, (Gage), surrounding the tool steel cutter, therefore, does not require the case to be trimmed to a precise or consistent length. Operation is controlled in reference to inside-bottom of case, not case mouth.</p><p></p><p>I am not telling anyone to do any Brass Prep if they choose not to.</p><p>Remember if you do anything incorrectly in reloading you probably won't get good results.</p><p></p><p>I do Brass Prep to all my cases because I like the groups I shoot.</p></blockquote><p></p>
[QUOTE="Coyote Shadow Tracker, post: 2630882, member: 116439"] They sell different size Prime Flash Hole Uniformers. Lapua Claims that their cases are already debured and don't need deburing. LAPUA also has a different size flash hole then other manufactures - so if you are going to uniform your Flash Holes make sure you use the correct tool. [LIST] [*].062 for Lapua 1.5mm flash holes [*].080 for "standard" flash holes [/LIST] The brass case is very important and sometimes important details are overlooked–such as the Primer Pocket and Flash Hole inside of the case. In cartridge manufacturing, the flash hole is "punched" into the brass. While this is the least expensive method, it has many shortcomings and inconsistencies. The flash holes, therefore, are of different sizes and shapes. The most detrimental to accuracy are the irregular "breakouts" and "burrs" on the inside. This will cause "shot-to-shot" differences in Primer "Flame Fronts", causing inconsistent pressure/velocity and, thereby, loss of accuracy. Bench Rest Shooters have been uniforming flash holes since 1969. The main reason for Flash Hole uniformity, Primer Pocket Uniformity, Primer Seating Depth is to get PROPER & CONSISTANT Flash Burn. Naturally you need to use the correct tools when preforming these modifications. With the Precision K & M UNIFORMER tools, you can realize the potential accuracy by simultaneously reaming, de-burring and chamfering the inside of the flash hole. The unique features of the K & M Tools provide uniformity with a pre-set depth stop, (Gage), surrounding the tool steel cutter, therefore, does not require the case to be trimmed to a precise or consistent length. Operation is controlled in reference to inside-bottom of case, not case mouth. I am not telling anyone to do any Brass Prep if they choose not to. Remember if you do anything incorrectly in reloading you probably won't get good results. I do Brass Prep to all my cases because I like the groups I shoot. [/QUOTE]
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